I'm taking it that you are discussing recreational marijuana. It is not legal in California. In the two states (Washington & Colorado) where recreational marijuana is legal you have to 21 years old to purchase, possess or use it.
Marijuana is not legal in any state at any age because the Federal Law trumps State Law and Marijuana is still illegal federally. Some states have decided to disregard federal law and enact statutes that allow the use of marijuana for either recreational (Colorado at age 21 and Washington State) or for medicinal purposes. Hope this answers your question.
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